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Ultrasonic Sensor

Software you will need to make this work…

HC-SR04-2

Ultrasonic Sensor

https://code.google.com/p/arduino-new-ping/downloads/detail?name=NewPing_v1.5.zip&can=2&q=

Put the “NewPing” folder in “libraries\”.

In the Arduino IDE software, create a new sketch (or open one) and select from the menubar “Sktech->Import Library->NewPing“.

Copy the code from lower in the page.

Ultra-Sonic-dimen

Shows the sound beam coming from the ultrasonic Sensor

400px-Sonar_Principle_EN.svg

Active sonar creates a pulse of sound, often called a “ping”, and then listens for reflections (echo) of the pulse.
To measure the distance to an object, the time from transmission of a pulse to reception is measured and converted into a range by knowing the speed of sound.

Sonar can be used underwater to detect fish.

Fishfinder

 

Wiring the Ultrasonic Sensor

ultrasonic sensor wiring

GND (-)

Vcc (+) goes to 5V

Trig goes to Pin 12

Echo goes to Pin 11

 

Code sample

// —————————————————————————
// Example NewPing library sketch that does a ping about 20 times per second.
// —————————————————————————

#include <NewPing.h>

#define TRIGGER_PIN 12 // Arduino pin tied to trigger pin on the ultrasonic sensor.
#define ECHO_PIN 11 // Arduino pin tied to echo pin on the ultrasonic sensor.
#define MAX_DISTANCE 200 // Maximum distance we want to ping for (in centimeters). Maximum sensor distance is rated at 400-500cm.

NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE); // NewPing setup of pins and maximum distance.

void setup() {
Serial.begin(115200); // Open serial monitor at 115200 baud to see ping results.
}

void loop() {
delay(50); // Wait 50ms between pings (about 20 pings/sec). 29ms should be the shortest delay between pings.
unsigned int uS = sonar.ping(); // Send ping, get ping time in microseconds (uS).
Serial.print(“Ping: “);
Serial.print(uS / US_ROUNDTRIP_CM); // Convert ping time to distance and print result (0 = outside set distance range, no ping echo)
Serial.println(“cm”);
}